Why is Dirk Nowitzki struggling overseas?

After a dominant postseason performance in which Dirk Nowitzki and the Dallas Mavericks won the NBA championship, why is Nowitzki having a difficult time at the FIBA European championships?

So far in the Olympic-qualifying tournaments, nine of FIBA Europe's top 15 scorers played in the NBA last season, as did FIBA Americas' top three scorers. Why are some doing well and others not so well?

ESPN.com Insider's Fran Fraschilla and David Thorpe have answers.

To read their Insider column, click here.